Answer:

Explanation:
For this case we assume that we want to find the electrical field at the point P as we can see on the figure attached.
The electrical field wormula is given by:
Where r is the distance from the point and the charge. On this case we can use the Pythagoras theorem and we got:


And now we can replace into the formula since we know that
and
, and we got:

The classical physics works on the Newton's laws of motion. It is applicable on heavenly bodies which are governed by the gravitational force. On the other hand, Quantum Physics is applicable for very low mass and sized bodies like electron, protons etc. The classical physics would accurately describe the motion of satellite moving with speed 7500 m/s using the following formula:

where G is the gravitational constant, M is the mass of the planet and v is the orbital speed. Then radius of the orbit can be described by this formula.
A warm up plan . Hope that helps
Answer:
The required work done by the resistive force = -22.3 kJ
Explanation:
We understand that the amount of work done for a force F and displacements is provided as the product of force multiplied by displacement, which can be represented as W = F.S
Now, when the cyclist travels east and returns west, the force and displacement directions will be opposite and they make an angle 180 degrees apart.
∴
W = -2 × 7.00 × 1590
W = -22260 J
W = -22.3 kJ
The north and south forces have no effect on the east and west forces.
We can handle the two groups separately.
(20N south) + (30N north)
= (20N south) + (20N north + 10N north)
= 10N north .
(40N east) + (50N west)
= (40N east) + (40N west + 10N west)
= 10N west .